Humans are the only animals with true chins.
Humans have a few biological advantages compared to other species. The most obvious is our big brains, which have empowered us to become the dominant species on Earth. But another feature that is often overlooked is our chins — yes, we’re the only animals on Earth with true chins. You might be thinking, “Wait a minute, I give my cat chin scratches all the time,” or “Surely chimpanzees, our closest animal cousin, sport some kind of chimp chin,” and the answer is nope and nope (respectively). When you’re scratching the “chin” of your feline companion, what you’re really doing is scratching the mandible, i.e., the lower part of the jaw — not the chin, which is the bony part that juts out at the bottom of your face. Elephants and manatees also have chin-like protrusions in their lower jaws, but they don’t quite qualify as true chins.